feat(tests): Adds video layout test.

tests/specs/alone/videoLayout.spec.ts

@@ -0,0 +1,27 @@
+import { ensureOneParticipant } from '../../helpers/participants';
+
+describe('Video Layout', () => {
+    it('join participant', () => ensureOneParticipant(ctx));
+
+    it('check', async () => {
+        const { p1 } = ctx;
+
+        const innerWidth = parseInt(await p1.execute('return window.innerWidth'), 10);
+        const innerHeight = parseInt(await p1.execute('return window.innerHeight'), 10);
+
+        const largeVideo = p1.driver.$('//div[@id="largeVideoContainer"]');
+        const filmstrip = p1.driver.$('//div[contains(@class, "filmstrip")]');
+        let filmstripWidth;
+
+        if (!await filmstrip.isExisting() || !await filmstrip.isDisplayed()) {
+            filmstripWidth = 0;
+        } else {
+            filmstripWidth = await filmstrip.getSize('width');
+        }
+
+        const largeVideoSize = await largeVideo.getSize();
+
+        expect((largeVideoSize.width === (innerWidth - filmstripWidth)) || (largeVideoSize.height === innerHeight))
+            .toBe(true);
+    });
+});